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How can I determine the tortuosity factor in a porous membrane?
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Aidan Doherty
How can I determine the tortuosity factor in a porous membrane?
There are many options. 1. Determine both the porosity and the effective diffusion coefficient. From this you could calculate the tortuosity. 2. Measure with NMR the self-diffusion coefficient of a liquid in the porous layer. Compare with the self-diffusion coefficient in the pure layer and you have the tortuosity. 3. Measure the conductivity.
There are many options. 1. Determine both the porosity and the effective diffusion coefficient. From this you could calculate the tortuosity. 2. Measure with NMR the self-diffusion coefficient of a liquid in the porous layer. Compare with the self-diffusion coefficient in the pure layer and you have the tortuosity. 3. Measure the conductivity.
There are many options. 1. Determine both the porosity and the effective diffusion coefficient. From this you could calculate the tortuosity. 2. Measure with NMR the self-diffusion coefficient of a liquid in the porous layer. Compare with the self-diffusion coefficient in the pure layer and you have the tortuosity. 3. Measure the conductivity.
There are many options. 1. Determine both the porosity and the effective diffusion coefficient. From this you could calculate the tortuosity. 2. Measure with NMR the self-diffusion coefficient of a liquid in the porous layer. Compare with the self-diffusion coefficient in the pure layer and you have the tortuosity. 3. Measure the conductivity.
Tortuosity is the property of curve being tortuous (having many turns). It is commonly used to describe diffusion and fluid flow in porous. It is often used as an adjustable parameter in models of transfer properties through porous media . Tortuosity is defined as the ratio of the lengths, Lt and L, of the preferential tortuous fluid pathways and the porous media, Tortuocity= Lt/L
For your reference, please look at the article website given below. Article entail the intraparticle tortuosity can be derived from the particle conductivity obtained from the Maxwell equation applied to data at infinite dilution of particles.
Tortuosity is the property of curve being tortuous (having many turns). It is commonly used to describe diffusion and fluid flow in porous. It is often used as an adjustable parameter in models of transfer properties through porous media . Tortuosity is defined as the ratio of the lengths, Lt and L, of the preferential tortuous fluid pathways and the porous media, Tortuocity= Lt/L
For your reference, please look at the article website given below. Article entail the intraparticle tortuosity can be derived from the particle conductivity obtained from the Maxwell equation applied to data at infinite dilution of particles.
By measurements: make a cross section image. With such small dimension I recommend epoxy mount + polishing + SEM imaging. Then from the image measure the tortuosity. By calculation: it only works if you know the size of the pores, their size distribution and if the pores are homogeneously distributed in the material.
By measurements: make a cross section image. With such small dimension I recommend epoxy mount + polishing + SEM imaging. Then from the image measure the tortuosity. By calculation: it only works if you know the size of the pores, their size distribution and if the pores are homogeneously distributed in the material.
Gianfranco Giorgianni, How can I measure the tortuosity using the conductivity test? I attached the SEM cross-section of the membrane. I have to test it in a wet and dried state and compare the results? Regards
Gianfranco Giorgianni, How can I measure the tortuosity using the conductivity test? I attached the SEM cross-section of the membrane. I have to test it in a wet and dried state and compare the results? Regards
Dear Thierry, Can you please explain more? Is it possible to use ImageJ for determining the l*? If Tortuosity= l*/L Where l* is determined by ImageJ and L is the membrane thickness.
Dear Thierry, Can you please explain more? Is it possible to use ImageJ for determining the l*? If Tortuosity= l*/L Where l* is determined by ImageJ and L is the membrane thickness.
There are many options.
1. Determine both the porosity and the effective diffusion coefficient. From this you could calculate the tortuosity.
2. Measure with NMR the self-diffusion coefficient of a liquid in the porous layer. Compare with the self-diffusion coefficient in the pure layer and you have the tortuosity.
3. Measure the conductivity.
There are many options.
1. Determine both the porosity and the effective diffusion coefficient. From this you could calculate the tortuosity.
2. Measure with NMR the self-diffusion coefficient of a liquid in the porous layer. Compare with the self-diffusion coefficient in the pure layer and you have the tortuosity.
3. Measure the conductivity.
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Have a look at this one, it may help.
Alain
Article Porous electrodes-based double-layer supercapacitors: Pore s...
Have a look at this one, it may help.
Alain
Article Porous electrodes-based double-layer supercapacitors: Pore s...
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In this paper you can find the constriction factor, f, this is the same than tortuosity
Article Cellular ceramics processed by paraffin emulsified suspensio...
In this paper you can find the constriction factor, f, this is the same than tortuosity
Article Cellular ceramics processed by paraffin emulsified suspensio...
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Tortuosity is the ratio of the length of the average pore to the membrane thickness or length.
Tortuosity is the ratio of the length of the average pore to the membrane thickness or length.
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There are many options.
1. Determine both the porosity and the effective diffusion coefficient. From this you could calculate the tortuosity.
2. Measure with NMR the self-diffusion coefficient of a liquid in the porous layer. Compare with the self-diffusion coefficient in the pure layer and you have the tortuosity.
3. Measure the conductivity.
There are many options.
1. Determine both the porosity and the effective diffusion coefficient. From this you could calculate the tortuosity.
2. Measure with NMR the self-diffusion coefficient of a liquid in the porous layer. Compare with the self-diffusion coefficient in the pure layer and you have the tortuosity.
3. Measure the conductivity.
More
VOTE
Dear Foroogh Khodadadi,
Tortuosity is the property of curve being tortuous (having many turns). It is commonly used to describe diffusion and fluid flow in porous. It is often used as an adjustable parameter in models of transfer properties through porous media .
Tortuosity is defined as the ratio of the lengths, Lt and L, of the preferential tortuous fluid pathways and the porous media, Tortuocity= Lt/L
For your reference, please look at the article website given below. Article entail the intraparticle tortuosity can be derived from the particle conductivity obtained from the Maxwell equation applied to data at infinite dilution of particles.
https://pubs.acs.org/doi/full/10.1021/ac071377r?src=recsys
Hope article is useful for you.
Ashish
Dear Foroogh Khodadadi,
Tortuosity is the property of curve being tortuous (having many turns). It is commonly used to describe diffusion and fluid flow in porous. It is often used as an adjustable parameter in models of transfer properties through porous media .
Tortuosity is defined as the ratio of the lengths, Lt and L, of the preferential tortuous fluid pathways and the porous media, Tortuocity= Lt/L
For your reference, please look at the article website given below. Article entail the intraparticle tortuosity can be derived from the particle conductivity obtained from the Maxwell equation applied to data at infinite dilution of particles.
https://pubs.acs.org/doi/full/10.1021/ac071377r?src=recsys
Hope article is useful for you.
Ashish
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Dear Ashish Thakur,
Thank you so much for your great answer.
Good luck
Dear Ashish Thakur,
Thank you so much for your great answer.
Good luck
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By measurements: make a cross section image. With such small dimension I recommend epoxy mount + polishing + SEM imaging. Then from the image measure the tortuosity.
By calculation: it only works if you know the size of the pores, their size distribution and if the pores are homogeneously distributed in the material.
By measurements: make a cross section image. With such small dimension I recommend epoxy mount + polishing + SEM imaging. Then from the image measure the tortuosity.
By calculation: it only works if you know the size of the pores, their size distribution and if the pores are homogeneously distributed in the material.
More
VOTE
Can you advice some papers on the methods you described, please?
Can you advice some papers on the methods you described, please?
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Gianfranco Giorgianni,
How can I measure the tortuosity using the conductivity test? I attached the SEM cross-section of the membrane. I have to test it in a wet and dried state and compare the results?
Regards
Gianfranco Giorgianni,
How can I measure the tortuosity using the conductivity test? I attached the SEM cross-section of the membrane. I have to test it in a wet and dried state and compare the results?
Regards
More
VOTE
Dear Thierry,
Can you please explain more? Is it possible to use ImageJ for determining the l*?
If
Tortuosity= l*/L
Where l* is determined by ImageJ and L is the membrane thickness.
Dear Thierry,
Can you please explain more? Is it possible to use ImageJ for determining the l*?
If
Tortuosity= l*/L
Where l* is determined by ImageJ and L is the membrane thickness.
More
VOTE